EP1287872B1 - Method for filtration of copper electrolyte solution - Google Patents
Method for filtration of copper electrolyte solution Download PDFInfo
- Publication number
- EP1287872B1 EP1287872B1 EP01921987A EP01921987A EP1287872B1 EP 1287872 B1 EP1287872 B1 EP 1287872B1 EP 01921987 A EP01921987 A EP 01921987A EP 01921987 A EP01921987 A EP 01921987A EP 1287872 B1 EP1287872 B1 EP 1287872B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- activated carbon
- filtration
- copper
- layer
- electrolyte
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
Definitions
- the present invention relates to a filtration method of copper electrolyte, and particularly, relates to a technique to improve filtration treatment efficiency with powdery activated carbon.
- a filtering aid such as diatomaceous earth and pearlite is precoated to a filter element such as filter cloth and a metallic screen. Copper electrolyte is passed thereto, thus depositing electrolytic by-products and dirt in the electrolyte to a surface of a precoated layer as filter cake, for removal. Filtration may be performed highly efficiently without clogging over a long period, and is extremely convenient even when a large volume of electrolyte is treated, so that this filtration method is widely used.
- the method also has an advantage in that filtration may be performed in accordance with the size and so forth of an object to be removed by appropriately selecting the type, particle size and so forth of a filtering agent.
- this precoating method has a limitation on filtering minute electrolytic by-products and dirt of 0.5 Pm or less. Also, in removing minute electrolytic by-products and so forth by reducing the particle size of a filtering agent, filtration efficiency sharply declines; in other words, permeation of electrolyte worsens, which is not practically preferable.
- activated carbon As a method to efficiently remove such minute electrolytic by-products and dirt, a filtration method with activated carbon is known. Since activated carbon has an excellent adsorption property, it is suitable for filtering and removing minute electrolytic by-products and so forth. Moreover, when copper electrolyte is treated with activated carbon, the physical property of obtained copper electrodeposits may be controlled, so that activated carbon is often used in a copper electrolytic plating.
- a so-called granular activated carbon having the particle size of about 5 to 60 mesh (2 to 0.25 mm) is filled in a cylindrical treatment column provided with a perforated plate inside, and copper electrolyte is passed through the treatment column for treatment.
- minute electrolytic by-products and dirt may be removed.
- the activated carbon in the treatment column forms sections so that the electrolyte may easily pass through, generating a so-called biased flow, and contact between the granular activated carbon and the copper electrolyte becomes insignificant.
- activated carbon of a large particle size is used, a contact area with copper electrolyte is small, so that filtration efficiency is not considered satisfactory.
- powdery activated carbon is likely to be mixed into copper electrolyte, and the mixed powdery activated carbon provides effects on the quality of copper electrodeposits.
- powdery activated carbon unlike granular activated carbon, it is difficult to fill the powdery activated carbon in a treatment column provided with a perforated plate and to continuously let copper electrolyte pass through, for an application. Thus, a batch processing method has to be taken. This is not preferable as an application to a step for a continuous copper electrolytic plating.
- the present invention is made under the above-noted circumstances as a background, and is to provide a filtration method of copper electrolyte that can remove minute electrolytic by-products and dirt and may also significantly improve filtration efficiency by improving a conventional filtration method, the so-called precoating method.
- a precoated layer of a filtering aid is formed on a filter element in advance.
- Activated carbon preliminary treatment solution containing powdery activated carbon is passed through the filter element formed with the precoated layer, and is also circulated until no powdery activated carbon leaks from an outlet of the filter element, thus forming a powdery activated carbon layer on the precoated layer.
- copper electrolyte is passed through for filtration.
- minute electrolytic by-products and dirt contained in copper electrolyte may be surely removed for filtration without mixing powdery activated carbon into copper electrolyte.
- powdery activated carbon is used, a contact surface area of the activated carbon sharply increases. A flow velocity may be reduced even at a large flow rate in volume. A long contact time may be ensured, and filtration efficiency may sharply improve.
- a characteristic of the present invention is to form a powdery activated carbon layer further on a precoated layer by'circulating the activated carbon preliminary treatment solution containing powdery activated carbon.
- the precoated layer of the filtering aid formed on the filter element has fine mesh, a so-called strainer, to let copper electrolyte pass through.
- powdery activated carbon is deposited on the strainer formed of the filtering aid, and the powdery activated carbon layer is formed on the precoated layer finally.
- the powdery activated carbon gradually fills up the strainer of the precoated layer and finally stops leaking therefrom.
- a powdery activated carbon layer through which only solution can pass is formed on the precoated layer.
- the filtering aid relating to the present invention may be a commonly known filtering aid. For instance, diatomaceous earth, pearlite, cellulose, and so forth may be used. Moreover, a filter element relating to the present invention may be filter cloth and a metallic screen, or other porous elements as long as a filtering aid may be precoated thereto and solution can pass through it by adding pressure to the solution. Additionally, the activated carbon preliminary treatment solution relating to the present invention is not particularly limited in its composition. For instance, copper electrolyte as a filtering object may be directly used, and the copper electrolyte may be diluted for use.
- any treatment solution may be used as long as the activated carbon preliminary treatment solution provides no effects on a copper electrolytic plating by being mixed into the copper electrolyte.
- filtration efficiency may improve further if a precoated layer and a powdery activated carbon layer are alternately deposited.
- a precoated layer is formed as the lowermost layer, and a powdery activated carbon layer and, moreover, a precoated layer may be sequentially deposited thereon.
- the number of layers and the thickness thereof may be appropriately decided in consideration of filtration efficiency, in other words, passage of copper electrolyte, and size, type, quantity and so forth of electrolytic by-products and dirt being removed.
- the powdery activated carbon for use in the filtration method of copper electrolyte relating to the present invention is preferably the one having 50 mesh (0.287 mm) or less in particle size, and more preferably the one having 50 to 200 mesh (0.074 to 0.287 mm) in particle size.
- the powdery activated carbon having 50 mesh or less particle size is powdery activated carbon that can pass through standard screen of 50 mesh. With powdery activated carbon of larger than 50 mesh in particle size, a surface area of an individual activated carbon particle becomes small, and filtration efficiency does not improve much. Moreover, in consideration of filtration efficiency, costs and so forth, 70 to 170 mesh activated carbon is preferable for actual operations.
- a term, powdery activated carbon, in the present invention is used above and below for not only the so-called powdery activated carbon but also granular activated carbon obtained by crushing or granulation.
- the thickness of a powdery activated carbon layer formed by the filtration method of copper electrolyte relating to the present invention is preferably 2 to 20 mm. When it is less than 2 mm, the removal of minute electrolytic by-products and dirt tends to become incomplete. When it is thicker than 20 mm, filtration efficiency, in other words, the passage of copper electrolyte becomes poor, and it is also undesirably costly.
- the filtering aid for use in the present invention is made of diatomaceous earth of 3 to 40 ⁇ m particle size. It is preferable to use the filtering aid in which diatomaceous earth of 3 to 15 ⁇ m particle size is mixed with diatomaceous earth of 16 to 40 ⁇ m particle size at the ratio of 7:3. By applying diatomaceous earth with the mixture of such particle sizes and mixing ratios, a powdery activated carbon layer may be easily formed, and filtration efficiency may improve significantly.
- FIG. 1 is a schematic view of a filtration device according to the embodiment.
- FIG. 2 is a particle size distribution graph of High-Flow Super Cell.
- FIG. 3 is conceptual cross sections of a precoated layer and a powdery activated carbon layer.
- Copper sulfate electrolyte is used to manufacture an electrolytic copper foil as an example for explanation in the embodiment.
- FIG. 1 is a schematic view of a filtration device relating to the embodiment.
- This filtration device 1 is provided with a filtration tank 2, a precoating tank 3, an activated carbon preliminary treatment tank 4, a solution feeding pump 5; and each is connected by a pipe. Moreover, each pipe is provided with an appropriate valve (V1 to V10).
- the copper sulfate electrolyte as a filtering object is introduced from an untreated solution inflow port A into the filtration device 1.
- the copper sulfate electrolyte filtered at the filtration tank 2 is transported from a filtrate outflow port B to an electrolytic copper foil manufacturing device not shown in the figure.
- This filtration tank 2 is the so-called vertical ultra filter type.
- Stainless wire leaves or strainer 6 covered with corrosion resisting filter cloth are provided in the tank 2 while being connected to a collecting pipe 7.
- the copper sulfate electrolyte flowing into the filtration tank 2 is collected at the collecting pipe 7 after passing through the strainer 6.
- the electrolyte is then transported to pipes linked to the precoating tank 3 and the activated carbon preliminary treatment tank 4 and a pipe linked to the filtrate outflow port B.
- a shower 8 for cleaning is provided above the strainer 6 in the filtration tank 2.
- diatomaceous earth For a filtering aid, diatomaceous earth, a so-called High-Flow Super Cell (trade name: Celite manufactured by Johns Mansville International, Inc.), is used. As diatomaceous earth for a filtering aid, the ones of various trade names such as Radiolite, Gemlite, Dicalite, and so forth may be used. However, among them, the grade of so-called High-Flow Super Cell, was used.
- This High-Flow Super Cell has a particle size distribution shown in FIG. 2. It is made of diatomaceous earth of 3 to 40 ⁇ m particle size, which is formed by mixing diatomaceous earth of 3 to 15 ⁇ m particle size and diatomaceous earth of 16 to 40 ⁇ m particle size approximately at the ratio of 7:3.
- the powdery activated carbon is activated carbon having 80 mesh or less particle size, and contains activated carbon of 100 mesh or less particle size at 95% or more.
- the activated carbon preliminary treatment solution was prepared by using copper sulfate electrolyte diluted with De-ionized water and adding powdery activated carbon thereto.
- Precoating is performed in the following procedure at the filtration device 1 shown in the embodiment.
- the liquid feeding pump 5 is driven to introduce copper sulfate electrolyte from the untreated solution inflow port A through a route of V1 ⁇ solution feeding pump 5 ⁇ V2 ⁇ filtration tank2 ⁇ V3 ⁇ precoating tank 3.
- a predetermined amount of copper sulfate electrolyte is filled into the precoating tank 3.
- the above-noted High-Flow Super Cell is introduced to the precoating tank 3, and is subsequently circulated through a route of precoating tank 3 ⁇ V4 ⁇ solution feeding pump 5 ⁇ V2 ⁇ filtration tank 2 ⁇ V3 and is dispersed in the copper sulfate electrolyte to which the High-Flow Super Cell is added.
- an agitator 9 provided at the precoating tank 3 is used.
- a precoated layer is formed by circulating solution in which the High-Flow Super Cell is dispersed, through a route of precoating tank 3 ⁇ V4 ⁇ solution feeding pump 5 ⁇ V2 ⁇ filtration tank 2 ⁇ strainer 6 ⁇ collecting pipe 7 ⁇ V5, and depositing the High-Flow Super Cell on a surface of the filter cloth at the strainer 6.
- activated carbon preliminary treatment solution to which the powdery activated carbon mentioned above was preliminarily mixed, is circulated through a route of activated carbon preliminary treatment tank 4 ⁇ V6 ⁇ solution feeding pump 5 ⁇ V2 ⁇ filtration tank 2 ⁇ strainer 6 ⁇ collecting pipe 7 ⁇ V7 to form a powdery activated carbon layer.
- circulating solution is visually observed at a transparent pipe section 10 formed of a transparent material provided near V7 to make sure if the powdery activated carbon is not leaking through the precoated layer, filter cloth and leaves.
- the powdery activated carbon is leaking, the circulating diluted copper sulfate is observed in cloudy black. As the leak decreases, the cloudiness of liquid decreases and transparent blue color solution may be observed at the end.
- FIG. 3 shows conceptual typical views of cross sections of a precoated layer and a powdery activated carbon layer which are formed as mentioned above.
- a precoated layer 13 of diatomaceous earth 12 is formed on a surface of filter cloth fibers 11.
- the powdery activated carbon layer 15 of the powdery activated carbon 14 is formed on a surface of the precoated layer 13 as shown in FIG. 3 (B).
- the activated carbon passes between individual particles of the diatomaceous earth 12 and leaks as shown in FIG. 3 (A).
- copper sulfate electrolyte as a filtering object is introduced from the untreated solution inflow port A.
- the copper sulfate electrolyte is then filtered through a route of V1 ⁇ solution feeding pump 5 ⁇ V2 ⁇ filtration tank 2 ⁇ strainer 6 ⁇ collecting pipe 7 ⁇ V8 ⁇ filtrate outflow port B.
- the precoated layer 12 may be further formed on the powdery activated carbon layer 14 shown in FIG. 3 (B).
- the precoated layer 12 is formed by the same method as previously explained, and the explanation is omitted.
- a powdery activated carbon layer is about 10 to 15 mm in thickness.
- a flow rate of copper sulfate electrolyte as a filtering object is 3 m 3 /min.
- the time for sulfate copper electrolyte to pass through the powdery activated carbon layer is about 10 to 20 seconds (flow velocity of 0.8 mm/sec.).
- thiourea was used as an additive to control surface smoothness as a property of an electrolytic copper foil, so as to manufacture an electrolytic copper foil.
- a conventional filtration method when thiourea is added to copper sulfate electrolyte for manufacture, an electrolytic copper foil with a smooth surface may be initially obtained. However, after a certain period, a phenomenon was found in which the smoothness cannot be kept. However, in case of the filtration method of the present embodiment, it was found that decomposition products of thiourea may be fully caught, and that an electrolytic copper foil with a smooth surface may be continuously manufactured.
- minute electrolytic by-products and dirt may be removed from copper electrolyte, and filtration efficiency may improve significantly. Accordingly, even if various types of additives are introduced to copper electrolyte to control properties of copper electrodeposits, copper electrodeposits having stable properties may be continuously manufactured.
Abstract
Description
Claims (5)
- Method for the filtration of copper electrolyte for removing electrolytic by-products and dirt which affect copper electrolysis, by passing copper electrolyte through a filter element precoated with a filtering aid, the filtration method comprising the step offorming a precoated layer of a filtering aid to a filter element in advance; characterized in that it further comprises the steps ofpassing activated carbon preliminary treatment solution containing powdery activated carbon, through the filter element formed with the precoated layer, and also circulating the activated carbon preliminary treatment solution until no powdery activated carbon leaks from an outlet of the filter element, thus forming a powdery activated carbon layer on the precoated layer; andsubsequently passing the copper electrolyte for filtration.
- The filtration method according to claim 1, wherein the precoated layers and the powdery activated carbon layers are alternately deposited to each other.
- The filtration method according to claim 1 or 2, wherein the powdery activated carbon has 0,287 mm (50 mesh) or less particle size.
- The filtration method according to any one of claims 1 to 3, wherein the powdery activated carbon layer is 2 to 20 mm thick.
- The filtration method according to one of claims 1 to 4, wherein the filtering aid is made of diatomaceous earth of 3 to 40 µm particle size, and is formed by mixing diatomaceous earth of 3 to 15 µm particle size and diatomaceous earth of 16 to 40 µm particle size at a ratio of 7:3.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000145923 | 2000-05-18 | ||
JP2000145923A JP3449549B2 (en) | 2000-05-18 | 2000-05-18 | Copper electrolyte filtration method |
PCT/JP2001/003440 WO2001087459A1 (en) | 2000-05-18 | 2001-04-23 | Method for filtration of copper electrolyte solution |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1287872A1 EP1287872A1 (en) | 2003-03-05 |
EP1287872A4 EP1287872A4 (en) | 2003-07-09 |
EP1287872B1 true EP1287872B1 (en) | 2004-06-02 |
Family
ID=18652359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01921987A Expired - Lifetime EP1287872B1 (en) | 2000-05-18 | 2001-04-23 | Method for filtration of copper electrolyte solution |
Country Status (10)
Country | Link |
---|---|
US (1) | US6616827B2 (en) |
EP (1) | EP1287872B1 (en) |
JP (1) | JP3449549B2 (en) |
KR (1) | KR100458049B1 (en) |
CN (1) | CN1223396C (en) |
AT (1) | ATE268206T1 (en) |
DE (1) | DE60103640D1 (en) |
MY (1) | MY122720A (en) |
TW (1) | TWI238860B (en) |
WO (1) | WO2001087459A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030150734A1 (en) * | 2002-02-11 | 2003-08-14 | Applied Materials, Inc. | Electroplating solution composition control |
CN101284704A (en) * | 2007-04-09 | 2008-10-15 | 株式会社日立制作所 | A treatment method, device and system of organic compounds included in waste water, and asphaltum recovering system |
KR101013674B1 (en) | 2008-09-30 | 2011-02-10 | 엘에스니꼬동제련 주식회사 | Apparatus for removing antimony in an electrolyte solution using activated carbon in copper electrolyte process |
CN102534739B (en) * | 2010-12-31 | 2014-10-15 | 北大方正集团有限公司 | Filtering device and filtering method |
TWI409366B (en) * | 2011-05-26 | 2013-09-21 | Briview Corp | Filtration device and filtration device maintaining method |
JP5558419B2 (en) | 2011-06-08 | 2014-07-23 | 株式会社東芝 | Copper recovery unit |
RU2561098C1 (en) * | 2014-05-28 | 2015-08-20 | Государственное Унитарное Предприятие "Водоканал Санкт-Петербурга" | Build up lamellar filter |
RU2587714C1 (en) * | 2015-02-25 | 2016-06-20 | Александр Петрович Горинов | Precoat filter cartridge (versions) |
CN110205655B (en) * | 2019-04-11 | 2022-01-25 | 浙江花园新能源股份有限公司 | Filling method of electrolytic copper foil diatomite filter aid |
CN110820019A (en) * | 2019-10-10 | 2020-02-21 | 湖南龙智新材料科技有限公司 | Copper dissolving system and process for electrolytic copper foil |
CN112604375A (en) * | 2020-12-28 | 2021-04-06 | 宜宾丝丽雅股份有限公司 | Method for deeply cleaning dipping alkali liquor |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4420401A (en) * | 1979-05-21 | 1983-12-13 | Shipley Company Inc. | Solution waste treatment |
US4238334A (en) * | 1979-09-17 | 1980-12-09 | Ecodyne Corporation | Purification of liquids with treated filter aid material and active particulate material |
JPS6339606A (en) * | 1986-08-06 | 1988-02-20 | Nippon Kokan Kk <Nkk> | Removing method for suspended matter, organic substance and dissolved inorganic substance contained in water |
US5047123A (en) * | 1989-06-09 | 1991-09-10 | Hydro-Tek, Inc. | Apparatus for clarifying liquids |
JP2960450B2 (en) * | 1989-12-22 | 1999-10-06 | ミウラエンジニヤリングインターナショナル株式会社 | Method and apparatus for precoating filter aid |
JPH08192015A (en) * | 1995-01-13 | 1996-07-30 | Nikko Gould Foil Kk | Method of filtering alkaline electrolyte containing copper |
JP2000107525A (en) * | 1998-09-30 | 2000-04-18 | Mitsui Mining & Smelting Co Ltd | Method for cleaning filter of copper electrolyte filter device |
-
2000
- 2000-05-18 JP JP2000145923A patent/JP3449549B2/en not_active Expired - Lifetime
-
2001
- 2001-04-13 TW TW090108901A patent/TWI238860B/en not_active IP Right Cessation
- 2001-04-17 MY MYPI20011817A patent/MY122720A/en unknown
- 2001-04-20 US US09/838,321 patent/US6616827B2/en not_active Expired - Lifetime
- 2001-04-23 KR KR10-2002-7000096A patent/KR100458049B1/en active IP Right Grant
- 2001-04-23 CN CNB018011705A patent/CN1223396C/en not_active Expired - Fee Related
- 2001-04-23 DE DE60103640T patent/DE60103640D1/en not_active Expired - Lifetime
- 2001-04-23 AT AT01921987T patent/ATE268206T1/en not_active IP Right Cessation
- 2001-04-23 EP EP01921987A patent/EP1287872B1/en not_active Expired - Lifetime
- 2001-04-23 WO PCT/JP2001/003440 patent/WO2001087459A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
KR20020029665A (en) | 2002-04-19 |
JP2001321617A (en) | 2001-11-20 |
ATE268206T1 (en) | 2004-06-15 |
MY122720A (en) | 2006-04-29 |
KR100458049B1 (en) | 2004-11-18 |
WO2001087459A1 (en) | 2001-11-22 |
CN1223396C (en) | 2005-10-19 |
CN1372487A (en) | 2002-10-02 |
JP3449549B2 (en) | 2003-09-22 |
TWI238860B (en) | 2005-09-01 |
US6616827B2 (en) | 2003-09-09 |
US20010042688A1 (en) | 2001-11-22 |
DE60103640D1 (en) | 2004-07-08 |
EP1287872A4 (en) | 2003-07-09 |
EP1287872A1 (en) | 2003-03-05 |
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